Coil spring assembly



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FIVE/Sf United States Patent 3,114,918 COIL SPRING ASSEMBLY John F. Young, Kendallville, Ind., assignor to No-Sag Spring Company, Detroit, Mich, a corporation of Michigan Filed Apr. 4, 1961, Ser. No. 100,622 4 Claims. (Cl. 260) This invention relates to cushions, and particularly to a cushion made of coil springs interconnected at the top in a manner to brace a border wire which extends about the top edge of the springs.

In long, narrow cushion constructions, such as that for davenports, foldable beds and the like, the wire bordering the top edge of the coil springs tends to spread apart when the springs are loaded. The unit is constructed with all parts assembled in relation, including the transverse wires on the bottom of the springs which are attached to a frame to mount the cushion in a piece of furniture. The springs herein illustrated are the conical type with the bottom coils secured at the junction between longitudinally and transversely extending wires. Each of the wires is offset slightly at the junction to receive the bottom turn of the coil which is disposed therebetween and retained in fixed position thereby.

A border wire, which may be rectangular in section, is secured to the outer edge of the top turn of the coils in tangential relation thereto. Coil springs, having eyes on the end disposed in crossed interlocked relationship, are employed for interconnecting alternate transverse rows of the springs. Bracing wires, interconnected by links, join the coils in adjacent rows which are alternately disposed relative to the rows having the crossed coils joining the springs. The bracing wires have the ends extended at right angles and disposed in parallel overlapping relation to the border wire. A clamping band secures the top coil, the ends of the bracing wires and the border wire in fixed relation to each other. The bracing wires prevent the frame from spreading when the cushion is occupied. The brace wires between the springs are interconnected by links having eyes on the ends which extend around the bracing wires and under the top turn of the opposite springs in the row. This fixes the top turn against movement laterally of each other while the links and the crossed coils fill the spaces between the top turns of the springs in the rows.

Accordingly, the main objects of the invention are: to provide a spring assembly having the bottom turns of conical coil springs supported at the intersection of wires forming a supporting grid, with the top turns joined to a border wire and to a bracing wire disposed between rows of the springs to which the top turn is secured; to connect opposite sides of a border wire of a spring assembly with bracing wires having right-angle end portions which overlie and are attached to the border wire and to the top coil of a row of springs therebet-ween; to brace the border wire of a spring assembly by wire elements having a main portion overlying the edge of a row of springs and end portions which overlie the border wire and are secured thereto by a suitable clip and to each other by links having eyes which extend thereover and under the adjacent top turn of spaced rows of springs to fill the space therebetween, and, in general, to provide a spring assembly with bracing means for the top turns of the springs and the border wire, which is simple in construction and economical of manufacture.

Other objects and features of novelty of the invention will be specifically pointed out or will become apparent when referring, for a better understanding of the invention, to the following description taken in conjunction with the accompanying drawing, wherein:

FIGURE 1 is a broken plan view of a spring assembly embodying features of the present invention;

"FIG. 2 is a sectional view of the structure illustrated in FIG. 1, taken on the line 22 thereof, and

FIG. 3 is a broken sectional view of the structure illustrated in FIG. 1, taken on the line 33 thereof.

In the figures, a plurality of conical-shaped coil springs 5 are mounted on a grid 6 made up of longitudinally extending wires 7 and transversely extending wires 8 which are deflected at their points of crossing 9 so that the bottom coils may be secured thereover, as illustrated more clearly in FIG. 2. The ends of the wires 7 and 8 of the grid are formed into eyes 11 by which the wires are secured to a :frame of a piece of furniture in which the spring cushion is to be installed. The top turns 12 of the coil springs 5 have a border wire 13 disposed in contact therewith either above, below or outwardly in the plane thereabove.

As illustrated in FIG. 2, the border wire 13 is of rectangular section to provide strength while reducing the resistance against downward deflection. The end rows 14 of the coil springs are directly secured to the border wire by bands 15 of conventional form. The interior rows of springs 16, 17, 18 and 19 are spaced from each other and from the end rows 14. The coil springs in the rows 14 and 16 are connected by crossed coils springs 21 which have eyes 22 at the ends which engage the top turn of the coil springs 5. Similar crossed springs 21 are disposed in the space between the rows 17 and (18 and in the space between the row 19 and the next adjacent row. In the space 24 between the rows 16 and 17, 17 and 18, links 25 are employed for interconnecting the top turn of the coil springs 5 located therein. Eyes 26 at each end of the link 25 hook over the transversely disposed wire 27 which rests upon the top turn of the springs and extend thereunder, as clearly shown in the figures.

The ends of the wires 27 are bent at right angles to form the securing portions 28 which rest upon the border wire 13 to which they are secured and to the top turn of adjacent springs by bands 15. The secured portions 28 of the wires 27 prevent the opposite portions of the border wire 13 from spreading when the spring unit is loaded. The opposite portions of the top turns of the coil springs are retained in predetermined relation to each other by the crossed springs 21. The wires 27 may be of a heavier gauge than the wires 7 and 8 of the grid or the wire from which the springs are wound. The extra strength in the wires 27 prevents the ends 28 from being distorted when a substantial force is applied thereto. Not only is the spring assembly formed in a unit by the border wire, the crossed springs 21 and the transverse wires 27, but the extending end portion 28 of the wires prevents the spreading of the opposite portions of the border wire when a load is applied to the assembly. When employing the wires 27 in this manner to prevent spreading of portions of the border wire, the wires form a dual function of additionally interlocking the top coils of the springs through the use of the links 25 in combination therewith.

What is claimed is:

1. In a spring assembly, spaced rows of coil springs, a wire grid interconnecting the bottom turns of the springs, a border wire disposed substantially tangential to the outer edge of the top turn of the edge springs, a pair of transverse wires resting on the adjacent edges of a pair of transverse rows of said springs, links having opposite ends extending under the top turns of the opposite adjacent spring of the rows, said ends being secured to said wires which rest upon the top turns of the springs, the ends of said wires extending parallel to and engaging the adjacent portions of the border wire, and means for securing the border wire, the top turn of the end springs of a row and the engaging wire portions in fixed relation to each other.

2. In a spring assembly, spaced rows of coil springs, a wire grid interconnecting the bottom turns of the springs, a border wire disposed substantially tangential to the outer edge of the top turn of the edge springs, a pair of transverse wires resting on the adjacent edges of a pair of transverse rows of said springs, links having opposite ends extending under the top turns of the opposite adjacent spring of the rows, said ends being secured to said wires which rest upon the top turns of the springs, the ends of said wires extending parallel to and engaging the adjacent portions of the border wire, means for securing the border wire, the top turn of the end springs of a row and the engaging wire portions in fixed relation to each other, and crossed coil springs filling another space between rows of the springs and secured to the top turns thereof.

3. In a spring assembly, spaced longitudinally and transversely disposed wires crossing each other at spaced points, coil springs having the bottom turn secured to a point of crossing of said wires, a border wire extending about the top turn of the springs, bands for securing the border wire to the top turn, the springs being disposed in transverse rows with spaces therebetween, the springs at 2 the sides of certain of said spaces being interconnected by crossed coil springs, and transversely disposed wires, certain other of said spaces between the rows of spring being spanned by links the ends of which extend under the top turn of the adjacent coils and are secured to said transverse wires which rest upon said top turns, the ends of said wires being bent at right angles and disposed adjacent to said border wire and secured thereto by the bands 4 securing the border wire to the top turn of the engaged springs.

4. In a spring assembly, spaced longitudinally and transversely disposed wires crossing each other at spaced points, coil springs having the bottom turn secured to a point of crossing of said wires, a border Wire extending about the top turn of the springs, bands for securing the border wire to the top turn, the springs being disposed in transverse rows with spaces therebetween, the springs at the sides of certain of said spaces being interconnected by crossed coil springs, and transversely disposed wires, certain other of said spaces between the rows of springs being spanned by links the opposite end of which extend under the top turn of the coils and are secured to said transverse wires which rest upon said top turns, the ends of said wires being bent at right angles and disposed adjacent to said border wire and secured thereto by the bands securing the border wire to the top turn of the engaged springs, said transverse wires being of larger gauge than the wire of the springs.

References Cited in the file of this patent UNITED STATES PATENTS 465,539 Rose Dec. 22, 1891 1,618,852 Tiffany Feb. 22, 1927 2,101,054 Eaton Dec. 7, 1937 2,120,093 Foster June 7, 1938 2,570,409 Van Hove Oct. 9, 1951 FOREIGN PATENTS 893,548 France Feb. 7, 1944 563,697 Belgium Jan. 31, 1958 

1. IN A SPRING ASSEMBLY, SPACED ROWS OF COIL SPRINGS, A WIRE GRID INTERCONNECTING THE BOTTOM TURNS OF THE SPRINGS, A BORDER WIRE DISPOSED SUBSTANTIALLY TANGENTIAL TO THE OUTER EDGE OF THE TOP TURN OF THE EDGE SPRINGS, A PAIR OF TRANSVERSE WIRES RESTING ON THE ADJACENT EDGES OF A PAIR OF TRANSVERSE ROWS OF SAID SPRINGS, LINKS HAVING OPPOSITE ENDS EXTENDING UNDER THE TOP TURNS OF THE OPPOSITE ADJACENT SPRING OF THE ROWS, SAID ENDS BEING SECURED TO SAID WIRES WHICH REST UPON THE TOP TURNS OF THE SPRINGS, THE ENDS OF SAID WIRES EXTENDING PARALLEL TO AND ENGAGING THE ADJACENT PORTIONS OF THE BORDER WIRE, AND MEANS FOR SECURING THE BORDER WIRE, THE TOP TURN OF THE END SPRINGS OF A ROW AND THE ENGAGING WIRE PORTIONS IN FIXED RELATION TO EACH OTHER. 